Is a bit peculiar and as far as i could see it can be replicated only on japanese computers when typing in japanese .This has been brought to my attention my my gf..
Every japanese compter comes with this keyboard button that containes this characters below

This buton situated between Esc and Tab is used to switch between Western characters and Japanese characters...
Now..every time this button is pressed in order to switch on kanji caracters somehow it activates k-meleon`s search function,and everything you will be typing will be replicated in the search bar below as you can see from the picture i uploaded here:

When you press enter at the end of the sentence your cursor will be moved out of the box you type and will highlight the last character that you typed..

most of the time your cursor will end up on the upper corner of the page where the
respective character would be...sometims if that character happens to contain a link k-meleon will automatically try to load the page that containes the link.... popong up a message asking you if you really want to leave the page or not...

This one for a guy who types using Chinese or Japanese characters it is verry anoying...